Enhanced Spatial Modulation aided OFDM System

Orthogonal frequency division multiplexing with Index Modulation (OFDM-IM) technique has recently attracted numerous research interests by applying the core idea of spatial modulation (SM) technology to the OFDM technology. In this paper, in order to further achieve the spatial and transmit diversity gain, a new scheme of enhanced spatial modulation (ESM) aided OFDM (ESM-OFDM) is proposed. This paper can be summarized as firstly, the ESM scheme is briefly reviewed. Then the technique of ESM-OFDM is elaborately introduced, which can carry more extra information bit compared to the OFDM-IM scheme. Furthermore, with the aid of maximum-likelihood (ML) detector, the asymptotic average bit error probability (ABEP) is presented. Finally, compared to conventional schemes such as OFDM, OFDM-IM, simulation results demonstrate that the spatial and transmit diversity gain is achieved to enhance the reliability over Rayleigh distribution and additive white Gaussian noise (AWGN) in wireless communication network.